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Common Mode Feedback for 2 stage difference differential Amplifier

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Shady Ahmed

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I am designing a difference differential amplifier following the attached schematic. With a folded cascode first stage & Common Source as a second stage.



I am wondering how would the CMFB circuit look like? What is the suitable architecture to implement it.
Also, will I need a CMFB circuit for each stage? or can I sense the output from the second stage and control a tail current / current mirror of the first stage?
 

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